07-06-2016, 08:37 AM
(This post was last modified: 07-06-2016, 08:57 AM by Brightcolours.)
So you did verify that the lens front focusses when specifically using AI-Servo too? AI-Servo does not have the same issues in PD AF concerning the lack of not checking if things ended up in focus.
Again, you have to send in the lens preferably with the body, to have the lens calibrated. The steps the lens makes and the steps the camera thinks it makes are not "in sync".
Live view is totally not connected to PD AF, so how the lens performs there is of no interest, really.
And concerning "firmware update", it is something that is not abnormal for PD AF, to have one lens or more not be in line with the AF system of the camera. It happens. And then the answer is always: you have to have the lens calibrated for that body. Some DSLRs are better than others in avoiding these issues, especially the current 5D series and 1D series have very few issues in this area And the 70D and up also seem to perform really rather accurately).
To illustrate the unpredictability of this concerning different bodies:
My 1st DSLR was the Canon EOS 350D, a little bit notorious for AF unpredictability. My Sigma 18-50mm f2.8 EX DC was pretty unreliable on it, focusing-wise. Which made me always hit the shutter button half way 2 or 3 times, till the focus looked ok. Later, on my 450D, the Sigma focussed just fine. The other way around with my Tokina 12-244mm f4. On the 350D, it was fine. On my 450D, the Tokina could not hit focus well at all, behind or in front of the subject was the norm.
In live view, the Sigma was not reliable, and the Tokina just laughable.
So, yeah... Just one thing you can do: get the lens calibrated with the body, and hope that they do a competent job.
Again, you have to send in the lens preferably with the body, to have the lens calibrated. The steps the lens makes and the steps the camera thinks it makes are not "in sync".
Live view is totally not connected to PD AF, so how the lens performs there is of no interest, really.
And concerning "firmware update", it is something that is not abnormal for PD AF, to have one lens or more not be in line with the AF system of the camera. It happens. And then the answer is always: you have to have the lens calibrated for that body. Some DSLRs are better than others in avoiding these issues, especially the current 5D series and 1D series have very few issues in this area And the 70D and up also seem to perform really rather accurately).
To illustrate the unpredictability of this concerning different bodies:
My 1st DSLR was the Canon EOS 350D, a little bit notorious for AF unpredictability. My Sigma 18-50mm f2.8 EX DC was pretty unreliable on it, focusing-wise. Which made me always hit the shutter button half way 2 or 3 times, till the focus looked ok. Later, on my 450D, the Sigma focussed just fine. The other way around with my Tokina 12-244mm f4. On the 350D, it was fine. On my 450D, the Tokina could not hit focus well at all, behind or in front of the subject was the norm.
In live view, the Sigma was not reliable, and the Tokina just laughable.
So, yeah... Just one thing you can do: get the lens calibrated with the body, and hope that they do a competent job.